Does anyone know why some birds have a bad molt? Do you think its because the are / were ill. Or maybe something like a change in the weather (temp, season etc).
I have chickens for years and none every looked like these pictures. The worst they get is they loose most of their tails for a few weeks.
If they are deprived of food in anyway, it can force them into a hard molt. I've had a situation where we were gone for a week and one hen made another hen's life miserable and kept her away from food. In that short time, she started a hard and ugly molt.
I had another time where I bought one of those treadle feeders. I followed the directions and all the hens got it but one. I figured the one would get on board. But it turns out she was simply terrified of the movement. It forced her into a hard molt too.